<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card >
            <!-- 添加角色按钮区域 -->
            <el-row>
                <el-col>
                    <el-button type="primary">添加角色</el-button>
                </el-col>
            </el-row>
            <!-- 添加角色列表区域 -->
            <el-table :data="roleList" border stripe>
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <el-row :class="['bdbottom',i1===0?'bdtop':'','vcenter']" v-for="(item1,i1) in scope.row.children" :key="item1.id">
                            <!-- 渲染一级权限 -->
                            <el-col :span="5">
                                <el-tag closable @close="removeRightById(scope.row,item1.id)">
                                    {{item1.authName}}
                                </el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <!-- 渲染二级和三级权限 -->
                            <el-col :span="19">
                                <!-- 通过for循环嵌套渲染二级权限 -->
                                <el-row :class="[i2===0?'':'bdtop','vcenter']" v-for="(item2,i2) in item1.children" :key="item2.id">
                                    <el-col :span="6">
                                        <el-tag type="success" closable @close="removeRightById(scope.row,item2.id)">{{item2.authName}}</el-tag>
                                        <i class="el-icon-caret-right"></i>
                                    </el-col>
                                    <el-col :span="18">
                                        <el-tag type="warning" v-for="(item3,i3) in item2.children" 
                                        :key="item3.id" closable @close="removeRightById(scope.row,item3.id)">
                                            {{item3.authName}}
                                        </el-tag>
                                    </el-col>                                    
                                </el-row>
                            </el-col>
                        </el-row>
                    </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index"></el-table-column>
                <el-table-column label="角色名称" prop="roleName"></el-table-column>
                <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
                <el-table-column label="操作" width="300px">
                    <template slot-scope="scope">
                        <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                        <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                        <el-button size="mini" type="warning" icon="el-icon-setting" 
                        @click="showSetRightDialog(scope.row)">分配权限</el-button>
                    </template>
                </el-table-column>

            </el-table>
        </el-card>
        <!-- 分配权限 -->
        <el-dialog
            title="分配权限"
            :visible.sync="setRightDialogVisible"
            width="50%" @close="setRightDialogClosed">
            <!-- 树形控件 -->
            <el-tree :data="rightsList" :props="treeProps" 
            show-checkbox default-expand-all node-key="id"
            :default-checked-keys="defKeys" ref="treeRef"></el-tree>
            <span slot="footer" class="dialog-footer">
                <el-button @click="setRightDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="allotRights">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data(){
        return{
            // 获取角色列表数据
            roleList:[],
            // 控制分配权限对话框的显示与隐藏
            setRightDialogVisible:false,
            // 所以权限的数据
            rightsList:[],
            // 树形控件的数据邦定对象
            treeProps:{
                label:'authName',
                children:'children'
            },
            // 默认选中的节点Id值数组
            defKeys:[],
            // 当前即将分配权限的角色id
            roleId:''
        }
    },
    created(){
        this.getRolesList()
    },
    methods: {
        // 获取所有角色的列表
        async getRolesList(){
            const{data:res} = await this.$http.get('roles')
            if(res.meta.status!==200){
                return this.$message.error('获取角色列表失败!')
            }
            this.roleList=res.data;
            console.log(this.roleList);
        },
        // 根据id删除对应的权限
        async removeRightById(role,rightId){
            // 弹框提示用户是否要删除组件
            const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err=>err)

            if(confirmResult!=='confirm'){
                return this.$message.info('删除已取消');
            }
            const {data:res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
            if(res.meta.status!==200){
                return this.$message.error('删除权限失败！');
            }
            // this.getRolesList();
            role.children=res.data;
        },
        // 展示分配权限的圣诞框
        async showSetRightDialog(role){
            this.roleId=role.id;
            // 获取所有权限的数据
            const{data:res} = await this.$http.get('rights/tree')
            if(res.meta.status!==200){
                return this.$message.error('获取权限数据失败！');
            }
            // 获取到的权限数据保存到rightsList
            this.rightsList=res.data;
            console.log(this.rightsList);
            // 递归获取三级节点的Id
            this.getLeafKeys(role,this.defKeys);
            this.setRightDialogVisible=true;
        },
        // 通过递归的形式，获取角色下所有三级权限和id,并保存到defKeys中
        getLeafKeys(node,arr){
            // 如果当前node节点不包含children属性，则是三级节点
            if(!node.children){
                return arr.push(node.id);
            }
            node.children.forEach(item=>
            this.getLeafKeys(item,arr));
        },
        setRightDialogClosed(){
            this.defKeys=[];
        },
        // 点击为角色分配权限
        async allotRights(){
            const keys=[
                ...this.$refs.treeRef.getCheckedKeys(),
                ...this.$refs.treeRef.getHalfCheckedKeys(),
            ]
            const idStr=keys.join(',');
            const{data:res}=await this.$http.post(`roles/${this.roleId}/rights`,{rids:idStr});
            if(res.meta.status!==200){
                return this.$message.error('分配权限失败！');
            }
            this.$message.success('分配权限成功！');
            this.getRolesList();
            this.setRightDialogVisible=false;
        }
    }
}
</script>

<style scoped>
.el-tag{
    margin:7px;
}
.bdtop{
    border-top: 1px solid #eee;
}

.bdbottom{
    border-bottom: 1px solid #eee;
}
.vcenter{
    display:flex;
    align-items: center;
}
</style>